A userscript that adds a code wrap toggle button
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// ==UserScript==
// @name GitHub Toggle Code Wrap
// @version 1.0.1
// @description A userscript that adds a code wrap toggle button
// @license https://creativecommons.org/licenses/by-sa/4.0/
// @namespace https://github.com/StylishThemes
// @include https://github.com/*
// @run-at document-idle
// @grant GM_registerMenuCommand
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_addStyle
// @author StylishThemes
// ==/UserScript==
/* global GM_registerMenuCommand, GM_getValue, GM_setValue, GM_addStyle */
/*jshint unused:true */
(function() {
"use strict";
/*
This code is also part of the GitHub-Dark Script (https://github.com/StylishThemes/GitHub-Dark-Script)
Extracted out into a separate userscript in case users only want to add this functionality
*/
var busy = false,
// set by GM popup menu
globalWrap = GM_getValue("github-global-code-wrap", true),
wrapIcon = "<svg xmlns='http://www.w3.org/2000/svg' width='768' height='768' viewBox='0 0 768 768'><path d='M544.5 352.5q52.5 0 90 37.5t37.5 90-37.5 90-90 37.5H480V672l-96-96 96-96v64.5h72q25.5 0 45-19.5t19.5-45-19.5-45-45-19.5H127.5v-63h417zm96-192v63h-513v-63h513zm-513 447v-63h192v63h-192z'/></svg>",
// inline code wrap css
wrapCss = {
"wrapped" : "white-space: pre-wrap !important; word-break: break-all !important; overflow-wrap: break-word !important; display: block !important;",
"unwrap" : "white-space: pre !important; word-break: normal !important; display: block !important;"
},
findWrap = function(event) {
var target = event.target;
if (target.classList.contains("ghd-wrap-toggle")) {
toggleClasses(target);
}
},
// equivalent to .next("code, pre, .highlight, .diff-table");
findNext = function(el) {
var nextSib = el.nextElementSibling;
if (/code|pre/i.test(nextSib.nodeName) ||
nextSib && (nextSib.classList.contains("highlight") ||
nextSib.classList.contains("diff-table"))) {
return nextSib;
} else {
return el;
}
},
toggleClasses = function(icon) {
var css,
code = findNext(icon);
if (code.querySelector("code")) {
code = code.querySelector("code");
}
if (!code) {
console.error("Code wrap icon associated code not found", icon);
return;
}
busy = true;
// code with line numbers
if (code.nodeName === "TABLE") {
if (code.className.indexOf("wrap-table") < 0) {
css = !globalWrap;
} else {
css = code.classList.contains("ghd-unwrap-table");
}
if (css) {
code.classList.add("ghd-wrap-table");
code.classList.remove("ghd-unwrap-table");
icon.classList.add("wrapped");
icon.classList.remove("unwrap");
} else {
code.classList.remove("ghd-wrap-table");
code.classList.add("ghd-unwrap-table");
icon.classList.remove("wrapped");
icon.classList.add("unwrap");
}
} else {
css = code.getAttribute("style") || "";
if (css === "") {
css = wrapCss[globalWrap ? "unwrap" : "wrapped"];
} else {
css = wrapCss[css === wrapCss.wrapped ? "unwrap" : "wrapped"];
}
code.setAttribute("style", css);
if (css === wrapCss.wrapped) {
icon.classList.add("wrapped");
icon.classList.remove("unwrap");
} else {
icon.classList.add("unwrap");
icon.classList.remove("wrapped");
}
}
busy = false;
},
getPrevSib = function(el, name) {
var prev = el.previousSibling;
while (prev) {
if (prev.nodeType !== 1 || !prev.classList.contains(name)) {
prev = prev.previousSibling;
} else {
return prev;
}
}
return null;
},
// Add code wrap toggle
buildCodeWrap = function() {
// mutation events happen quick, so we still add an update flag
busy = true;
// add wrap code icons
var tmp,
wrapper = document.querySelectorAll(".blob-wrapper"),
indx = wrapper ? wrapper.length : 0,
// <div class='ghd-wrap-toggle tooltipped tooltipped-w' aria-label='Toggle code wrap'>
icon = document.createElement("div");
icon.className = "ghd-wrap-toggle tooltipped tooltipped-w";
icon.setAttribute("aria-label", "Toggle code wrap");
icon.innerHTML = wrapIcon;
// $(".blob-wrapper").prepend(wrapIcon);
while (indx--) {
if (!wrapper[indx].querySelector(".ghd-wrap-toggle")) {
wrapper[indx].insertBefore(icon.cloneNode(true), wrapper[indx].childNodes[0]);
}
}
// $(".markdown-body pre").before(wrapIcon);
wrapper = document.querySelectorAll(".markdown-body pre");
indx = wrapper ? wrapper.length : 0;
while (indx--) {
tmp = getPrevSib(wrapper[indx], "ghd-wrap-toggle");
if (!tmp) {
wrapper[indx].parentNode.insertBefore(icon.cloneNode(true), wrapper[indx]);
}
}
busy = false;
},
init = function() {
document.addEventListener("click", findWrap);
if (!globalWrap) {
document.querySelector("body").classList.add("nowrap");
}
buildCodeWrap();
},
// DOM targets - to detect GitHub dynamic ajax page loading
targets = document.querySelectorAll([
"#js-repo-pjax-container",
// targeted by ZenHub
"#js-repo-pjax-container > .container",
"#js-pjax-container",
".js-preview-body"
].join(","));
// don't initialize if GitHub Dark Script is active
if (!document.querySelector("#ghd-menu")) {
GM_addStyle([
// icons next to a pre
".ghd-wrap-toggle { position:absolute; right:1.4em; margin-top:.2em; -moz-user-select:none; -webkit-user-select:none; cursor:pointer; z-index:20; }",
// file & diff code tables
".ghd-wrap-table td.blob-code-inner { white-space: pre-wrap !important; word-break: break-all !important; }",
".ghd-unwrap-table td.blob-code-inner { white-space: pre !important; word-break: normal !important; }",
// icons inside a wrapper immediatly around a pre
".highlight > .ghd-wrap-toggle { right:.5em; top:.5em; margin-top:0; }",
// icons for non-syntax highlighted code blocks; see https://github.com/gjtorikian/html-proofer/blob/master/README.md
".markdown-body:not(.comment-body) .ghd-wrap-toggle:not(:first-child) { right: 3.4em; }",
".ghd-wrap-toggle svg { height:1.25em; width:1.25em; fill:rgba(110,110,110,.4); pointer-events:none; }",
".ghd-wrap-toggle.unwrap:hover svg, .ghd-wrap-toggle:hover svg { fill:#8b0000; }", // wrap disabled (red)
"body:not(.nowrap) .ghd-wrap-toggle:not(.unwrap):hover svg, .ghd-wrap-toggle.wrapped:hover svg { fill:#006400; }", // wrap enabled (green)
".blob-wrapper, .markdown-body pre, .markdown-body .highlight { position:relative; }",
// global code wrap
".blob-code-inner,",
".markdown-body pre > code,",
".markdown-body .highlight > pre {",
"white-space: pre-wrap !important;",
"word-break: break-all !important;",
"overflow-wrap: break-word !important;",
"display: block !important;",
"}",
"td.blob-code-inner {display: table-cell !important;}"
].join(""));
// update TOC when content changes
Array.prototype.forEach.call(targets, function(target) {
new MutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
// preform checks before adding code wrap to minimize function calls
if (!busy && mutation.target === target) {
buildCodeWrap();
}
});
}).observe(target, {
childList: true,
subtree: true
});
});
// Add GM options
GM_registerMenuCommand("Set Global Code Wrap Option", function() {
var body = document.querySelector("body"),
val = prompt("Global Code Wrap (true/false):", globalWrap);
globalWrap = /^t/.test(val);
GM_setValue("github-global-code-wrap", globalWrap);
if (!globalWrap) {
body.classList.add("nowrap");
} else {
body.classList.remove("nowrap");
}
});
init();
}
})();